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The Prevention and Control Method of Influence of External Insulation Leakage Current of Capacitive Current Transformer

A current transformer and leakage current technology, applied in the direction of inductors, measuring resistance/reactance/impedance, instruments, etc., can solve the problems that affect capacitance, trouble transformer dielectric loss factor measurement, etc., and achieve the effect of reliable measurement data

Inactive Publication Date: 2011-12-21
大连互感器有限公司
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Problems solved by technology

[0003] Regarding the measurement of the dielectric loss factor of the transformer, the national standard stipulates that the relative humidity of the measurement environment shall not be greater than 60%, the purpose of which is to reduce the influence of the external leakage current of the transformer on the measurement results, and to reduce the impact of the external leakage current of the transformer on the measurement results. The influence of the measurement results generally needs to choose a suitable environment, but it is often difficult to achieve a suitable environment, so sometimes it is necessary to use the method of using infrared light bulbs to bake, or the method of temporarily adding shielding on the periphery of the porcelain sleeve to solve the problem, but using Such a method will affect the capacitance of the measured object, so the influence of the external leakage current of the transformer on the measurement results has always troubled the measurement of the dielectric loss factor of the transformer.

Method used

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  • The Prevention and Control Method of Influence of External Insulation Leakage Current of Capacitive Current Transformer
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  • The Prevention and Control Method of Influence of External Insulation Leakage Current of Capacitive Current Transformer

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Embodiment Construction

[0017] The present invention is described in detail below in conjunction with accompanying drawing:

[0018] The prevention method for the influence of the leakage current of the external insulation of the capacitive current transformer: a layer of conductive material 17 for collecting the leakage current is coated on the outer surface of the porcelain sleeve of the current transformer. The current is collected; and a connecting wire 19 is set, one end of which is connected to 17 layers of conductive material, and the other end is connected to the ground terminal 5 on the current transformer case 4, wherein the leakage current is directly introduced into the case 4 with the connecting wire 19 The ground terminal 5 on the top; the bottom of the conductive material 17 is coated with a layer of insulating varnish 18, and the function of the insulating varnish 18 is to insulate the conductive material 17 that collects the leakage current from the box shell 4, so that the leakage cu...

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Abstract

The invention relates to a method for preventing and controlling the influence of the external insulation leakage current of a capacitive current transformer. The invention belongs to the technical field of transformer testing, and more precisely, belongs to the technical field of measuring the dielectric loss factor of a transformer. By adopting the method of the invention, the dielectric loss factor of the transformer can be measured under any environment relative humidity, and the reliability of the measurement data can be ensured. Product testing will not be affected by weather conditions.

Description

[0001] technical field [0002] The invention relates to a method for preventing and controlling the influence of an external leakage current of a capacitive current transformer. The invention belongs to the technical field of transformer testing, and more precisely, belongs to the technical field of measuring the dielectric loss factor of a transformer. Background technique [0003] Regarding the measurement of the dielectric loss factor of the transformer, the national standard stipulates that the relative humidity of the measurement environment shall not be greater than 60%, the purpose of which is to reduce the influence of the external leakage current of the transformer on the measurement results, and to reduce the impact of the external leakage current of the transformer on the measurement results. The influence of the measurement results generally needs to choose a suitable environment, but it is often difficult to achieve a suitable environment, so sometimes it is nec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F38/30G01R27/26
Inventor 姜德民
Owner 大连互感器有限公司
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